Is Benadryl Safe With Children's Cough DM (Dextromethorphan)?
In our latest question and answer, the pharmacist discusses whether or not Benadryl (diphenhydramine) and dextromethorphan can be used together.
Can Children Benadryl be taken with Children's Cough DM?
- There is no known drug interaction between Benadryl (diphenhydramine) and Children's Cough DM (dextromethorphan).
- Some over-the-counter products even contain both ingredients, such as 'Diabetic Tussin'.
- Although there is no drug interaction between Benadryl and Children's Cough DM, both can cause drowsiness, so you may feel tired after taking them.
Hello and thanks for reaching out to us! I'm more than happy to answer this for you.
In your question, you don't mention exactly what product you are referring to with 'Children's Cough DM'.
However, this product name is shared between many different store-brand (i.e. generic) cough medicines, like these products available from Walgreens, CVS, and Walmart:
All of these 'Children's Cough DM' products are made and marketed to be compared to the brand name product, Children's Delsym.
All of these products contain the same active ingredient, dextromethorphan.
Can You Use Both Together?
As mentioned in the section above, Children's Cough DM products and brand name Delsym contain the cough suppressant, dextromethorphan.
In fact, it's not uncommon for some over-the-counter cough/cold products to contain both an antihistamine, like Benadryl, and dextromethorphan.
For example, Diabetic Tussin has both drugs in it.
I will say that even though Benadryl and dextromethorphan can be used together (and may even be combined into a single product), both can make you a little tired.
Benadryl is well-known to cause sedation, which is why it is so commonly used as a sleep aid.
While dextromethorphan generally doesn't cause as much sedation as Benadryl, it still does cause drowsiness in some individuals. Therefore, if you combine both, just be aware you're likely to feel tired since both can have this effect.
Thanks again for reaching out to us. Feel free to contact us with any further questions!
- Dr. Brian Staiger, PharmD
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